Alkyl derivatives of diphenolisatine and process for making same



Patented Apr. 24,1928.

UNITED STATES PATENTOFFICE.

ANDRE BLANKART, OF BASEL, SWITZERLAND, ASSIGNOB TO THE HOFFMANN-LA ROCHE CHEMI ECAL WORKS, OF NEW YORK, N. Y A CORPORATION OF NEW YORK.

ALKYL DERIVATIVES OF DIPHENOLISATINE AND PROCESS FOR MAKING SAME- No Drawing. Application filed July 7, 1927, Serial No. 204,150, and in Switzerland October 9, 1926.

Until now it was supposed that the action groups, are excellent laxatives with a relia ble and constant action even in very small doses. For the blocking of the h droxyls alkyl groups, such as the methyl, t e ethyl, the methylphenyl group, are used. l5

tives of diphenolisatinc, diphenolisatine is treated with the usual alkylatingagents. In this manner the alkyl derivatives of diphe nolisatine are obtained with a very good zo'yield and in pure form. According to the ounds or O-dialkyl-N-alkyl compounds are ormed. Gradual alkylizinois alsopossible'. by transforming the O-dia kyl compounds. first 'obtained into O-dialkyl-N-alkyl compounds. Mi xed alkyl compounds may fur- Y ther be obtained. By. acetylizing the O-dial compounds are transformed into N-acetyl compounds.

caustic sodium in gravimetricalparts of water; to the hot solution .40'gravimetr1cal parts of diniethylsulphate are slowly added,- eating being continued over a. 'fwater-bath.' After an hour the reaction product is cooled, I

filteredv .and crystallized from alcohol.

Nnietl yl-di-anisol isatine is obtained as a crystallized powderemelting at-152 C.

- The same compound is obtained byboiL'. ing 10 gravimetrical parts of di-anisolj isatine 1n a solution of 1.6 'gravimetrical;

parts of caustic sodium -in. 30 *gravimetrical parts of water during an hour with a refluxcondenser and adding at the same time 3.7

gravimetrical parts of dimethylsulphate.

For the manufacture of the alkyl derivaianafacturing conditions O-dialkyl com The alkyl derivatives of diphenolisatine are crystallizing, neutrally reacting, very constant compounds which with ferricyaa nate of potassium and a solution of sodium hydroxide show no colour reaction. In water, alkali and acids they are insoluble, but dissolve easily in the usual organic solvents, alcohol, benzol, concentrated acetic acid and the like.

" Example 1. 40

96 gravimetrical parts of diphenoli'satimr are dissolved in ,a solution of 24.6 gravif' metrical parts of caustic sodium in 180 gravimetrical parts of water and while coolmg 7 8 gravimetrical partsof dimethylsulphate are slowly added. When the precipitate has become solid the liquid is filtered off and the product washed with a solution of sodium hydroxide and water and crystal-' to lized from alcohol. Di-anisol-isatine is thus obtained in fine prisms melting at 117-118"- C. By boiling with acetic acid anhydride and sodium acetate it is transformed into Nacetyl-di-anisol-isatine melting at 153 C. Ilhe following formulas illustrate the products of this example: Y

The following formula illustrates the product of this example:

13H:- N-methyl-di-aniseI-isatino.

' Example 3. H 6.3 gravimetrical parts of diphenolisatine are dissolved in, 50-gravimetrieal parts of alcohol and heated with afsolution of 2.4 grav-imetricalparts of' causticsodium in 50',

gravimetrical parts of water and 5 avimetrical parts of ethyl-'odide during 2 ours which may be.-

new

to about 60 C. with a reflux condenser. The alcohol is then distilled 011', the reaction product diluted with water, the precipitate filtered, repeatedly washed with dilute solution of sodium hydr fromconcentracted acetic acid. Di-phenetolisatine is obtained as a micro-crystalline owder melting at 60C. The following ormula. illustrates the product of this example:' Y F Ewample. 11.3 gravimetrical parts of 'di-guaiacolisatine are dissolved ina solution of 3.7 gravimetricalparts of. caustic potassium in 50 gravimetricalpartsof water, and the solution thus-obtained is shaken during-several hours with 10.5 gravimetrical parts of. benzyl-bromide. The nitxure-is then heated for ashort time to about 50 0., during which process the reactionproduct clogs to gether. "and when cooling becomes solid.- It

' is filtered, washed with a splution of sodium hydroxide and crystallized from benzme.

* Di- O-isopropyl)-phenolisatine.

I claim': 1. As new products the alkyl derivatives of diphenolisatine which may be produced by treating.diphenolisatine with an alkylat ingagent; the new products being crystaling, neutrally reacting, very constant com-. pounds showing with ferricyanate or potassium and a solution. of sodium hydroxide no colour-reaction, and being insoluble in water, alkali and acids, but dissolving easil in the usual organicsolvents, alcohol, benzo concentrated acetic acid and the like. 1

2. As a new reduced by treating diphenolisat-ine wit an ethylating agent; the

crysta ine powder melting at 60 (3., showing with ferricyanate of potassium and a oxide and crystallized.

anhydride and so ium product di phenetolsisatine roduct' being obtamed as a micr0 hand.

Di- (osbenzyl) -guaiacol-isatine is r obtained in fine needlesmelting at 104 C. The fol- .lowing formula illustrates the product of this example: y v

v i o-C'm-O F cm Di-(O-benZyD-guatacOI-Isatine.

Ewample I120 gravimetrical partsof diphenolisatine are dissolved-in a solutionof 5 gravimetrical parts of caustic sodium in 100 gravimetrical parts of water and after the addition of 15.6 gravimetrical parts of isopropyl-bromide heated during 2 hours with a reflux condenser. whereby the product becomes solid. After cooling the mixture is filtered,

washed with dilute solution ofjsodium hydroxide and finally re-crystallized from concentrated acetic acid. Di- (O-isopropyl)-v phenoli-satine thus obtained melts at 237- 238 C. v By acet liz'in with acetic acid getate N-acetyl-dirisopropylkphenolisatine, melting at 145- 146 (1., is obtained. The follo'wingformulas illustrate the products of this example:

- I OH: OF n C CH 30-013.: N-acetyl-di- (Q-isopropyl) -'phenolisatine.

solution of sodium hydroiride no colour-reaction, and being insoluble inlwater, alkalis andacids, but dissolving easily in the usual organic solvents, alcohol, benzol, concentrated acetic acid and the like.

3. The process 'for the manufacture of derivatives ofv diphenolisatine which consists in treating diphenolisatine with an alkylating agent. 4. The process i-phenolisatine with iphenolisatine with JethyLiodide.

In witness whereof I have hereunto set my a. BLANKART.

, p for the manufacture of di- 4 A henetol-isatine which consists in treating.

process for the manufactureof dihenetol-isatme 'which'consists in treatin 

